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Stress‐Drop Variations of Induced Earthquakes in Oklahoma

2018; Seismological Society of America; Volume: 108; Issue: 3A Linguagem: Inglês

10.1785/0120170335

1943-3573

Qimin Wu, M. C. Chapman, Xiaowei Chen,

Seismic Performance and Analysis

Research Article| May 01, 2018 Stress‐Drop Variations of Induced Earthquakes in Oklahoma Qimin Wu; Qimin Wu aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, Virginia 24061, wqimin86@vt.edu, mcc@vt.educNow at ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019. Search for other works by this author on: GSW Google Scholar Martin Chapman; Martin Chapman aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, Virginia 24061, wqimin86@vt.edu, mcc@vt.edu Search for other works by this author on: GSW Google Scholar Xiaowei Chen Xiaowei Chen bConocoPhillips School of Geology and Geophysics, University of Oklahoma, 100 East Boyd Street, Norman, Oklahoma 73019, xiaowei.chen@ou.edu Search for other works by this author on: GSW Google Scholar Author and Article Information Qimin Wu aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, Virginia 24061, wqimin86@vt.edu, mcc@vt.educNow at ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019. Martin Chapman aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, Virginia 24061, wqimin86@vt.edu, mcc@vt.edu Xiaowei Chen bConocoPhillips School of Geology and Geophysics, University of Oklahoma, 100 East Boyd Street, Norman, Oklahoma 73019, xiaowei.chen@ou.edu Publisher: Seismological Society of America First Online: 01 May 2018 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2018) 108 (3A): 1107–1123. https://doi.org/10.1785/0120170335 Article history First Online: 01 May 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Qimin Wu, Martin Chapman, Xiaowei Chen; Stress‐Drop Variations of Induced Earthquakes in Oklahoma. Bulletin of the Seismological Society of America 2018;; 108 (3A): 1107–1123. doi: https://doi.org/10.1785/0120170335 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract We calculate corner frequencies and stress drops for 201 earthquakes in four earthquake sequences that are potentially induced by wastewater injection in Oklahoma. Specifically, we determine stress drops for 35 events in the 6 November 2011 Mw 5.6 Prague sequence, 40 events in the 13 February 2016 Mw 5.1 Fairview sequence, 73 events in the 3 September 2016 Mw 5.8 Pawnee sequence, and 53 events in the 7 November 2016 Mw 5.0 Cushing sequence. Although the stress‐drop estimates show large scatter for individual sequences, we find high stress drops for three of the four Mw 5+ mainshocks (17–34 MPa, Brune stress drop) and lower stress drops for most of the foreshocks/aftershocks in each individual sequence. The exception is the 2011 Prague sequence, which has stress drops ranging between 0.03 and 76 MPa, and the mainshock has a low stress drop of 3.25 MPa. Compared with the other three sequences, the 2016 Fairview sequence exhibits more constant stress‐drop estimates, with a two to three times higher median stress drop. We find significant scatter in the stress‐drop estimates of small earthquakes (⁠Mw<4⁠) and note that the earthquakes greater than Mw 4 have systematically larger stress drops than the average stress drop observed for earthquakes below Mw 4. We observe no clear evidence for depth dependence or temporal patterns of stress‐drop estimates. The large spatial variability of stress drops reflects strong fault heterogeneity in this area, which is likely influenced by the injection of fluids into the subsurface. Given the large variations of stress drop, our results do not support the suggestion of using low stress drops in ground‐motion prediction models for seismic hazard assessment of induced earthquakes in the central and eastern United States (CEUS). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.